page_title: U.S. Route 91
section_title: Route description
hierarchical_section_title: U.S. Route 91 / Route description
caption_attribution_description: English: US-91 south of Richmond, Utah.
context_page_description: U.S. Route 91 or U.S. Highway 91 is a 172.663-mile-long north–south United States highway running from Brigham City, Utah to Idaho Falls, Idaho in the U.S. states of Idaho and Utah. Despite the "1" as the last digit in the number, US-91 is no longer a cross country artery. The highway currently serves to connect the communities of the Cache Valley to Interstate 15 and beyond. Prior to the mid-1970s, US 91 was an international commerce route from Long Beach, California to the Canada–US border north of Sweetgrass, Montana. US 91 was routed on the main streets of most of the communities it served, including Las Vegas Boulevard in Las Vegas and State Street in Salt Lake City. From Los Angeles to Salt Lake, the route was built along the corridor of the Arrowhead Trail. US 91 has been largely replaced by Interstate 15. A portion of the highway's former route in California is currently State Route 91.
caption: US-91 in Cache Valley
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